PMID: 3568778May 1, 1987

Canine tracheal injury by neodymium-YAG laser irradiation

R L GoodmanE G King


The relationship between endoscopic graded neodymiumyittrium aluminum garnet (Nd-YAG) laser intensity and the magnitude of effects on the tracheal wall was studied in two mongrel dogs. The dogs were anesthetized and graded Nd-YAG laser burns of 50, 100, and 200 Joules (J) were produced on the distal tracheal walls with a laser fiber inserted through a bronchoscope. One dog was killed immediately after injury and the other 24 hours later. At the time of killing, the trachea was excised and prepared for light microscopic (LM) and scanning electron microscopic (SEM) examination. We found that the injury produced by the 50 J intensity beam was confined to the mucosa and submucosa, with no destruction of the tracheal cartilage; by contrast, transmural penetration of the trachea was observed at intensities of 100 and 200 J. These results indicate that a strong correlation exists between laser intensity and the magnitude of the resulting tracheal injury. We suggest that the intensity of a Nd-YAG laser, endoscopically directed perpendicular to the tracheal wall, should not exceed 50 J in order to minimize the risk of perforating the tracheal wall.


Oct 1, 1984·Chest·A Arabian, S V Spagnolo
Nov 1, 1984·Chest·A F Gelb, J D Epstein
Jan 1, 1984·Lasers in Surgery and Medicine·S N JoffeS S Rao
Jan 1, 1983·Research in Experimental Medicine. Zeitschrift Für Die Gesamte Experimentelle Medizin Einschliesslich Experimenteller Chirurgie·B Helpap
Jan 1, 1981·Lasers in Surgery and Medicine·T HalldórssonF Frank
Jan 1, 1983·Lasers in Surgery and Medicine·J C Fisher
Jan 1, 1980·Lasers in Surgery and Medicine·T A Fuller


May 1, 1993·Thorax·S Lam
Sep 1, 1992·Experimental and Toxicologic Pathology : Official Journal of the Gesellschaft Für Toxikologische Pathologie·K SchaarschmidtE Unsöld
Feb 1, 1991·Journal of Clinical Laser Medicine & Surgery·J S LiuY Hayata
Jan 1, 1992·The American Review of Respiratory Disease·S T WeissF E Speizer

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